Carbureter



C. H. ANDERSON.

CARBURETER.

APPLICATION FILED IAN. n, 1919.

Patented Dec. 21, 1920.

2 SHEETS-SHEET- I.

C. H. ANDERSON.

CARBURETER.

APPLlCATlON FILED JAN. 17, I919.

Patented Dec. 21, 1920.

2 SHEETS-SHEET 2- "llfllllllllllllllllllllllllllllllllllll) PATENTOFFICE.

CHARLES H. ANDERSON, OF LEXTNGTON, KENTUCKY.

CARBURETER.

Appfication filed January 17, 1919.

T 0 all whom it may concern:

Be it known that I, CHARLES H. ANDER- SON, a citizen of the UnitedStates, and a resident of Lexington, in the county of F ayettc and Stateof Kentucky, have invented certain new and useful Improve ments inCarbureters for Gasolene-Engines; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

My invention relates to an improvement in carbureters for gasoleneengines, one object being to provide improved means for opening theneedle valve-by the suction of the engine and for holding it open Whilethe engine is running, the extent of opening movement of the said needlevalve being controlled by the movement of the throttle valve in thesuction pipe.

A further object is to provide means for independently adjusting theneedle valve with relation to the throttle valve.

A further object is to provide means where ,by after the throttle andthe needle valve have been adjusted for relative movement, the needlevalve controlling means may be re-adjusted without disturbing thethrottle valve.

A further object is to provide means for yieldingly holding the needlevalve in its seat when the engine is not running.

/Vith these and other objects in view my invention consists in the partsand combination of parts as will be more fully explained and pointed outin the claims.

In the accompanying drawings Figure 1 is a view in side elevation of myimprovement; Fig. 2 is a View in vertical longitudinal section of thesame; Fig. 3 is a view in horizontal section on the line a? m of Fig. 1and Fig. 4: is a view in elevation of the needle valve and its actuatingmechanism, one half of the casing being shown in section.

1 represents the suction tube of a carbureter having a flanged end 2 forits attachment to the intake manifold of an internal combustion engine.The throttle valve 3 is secured to a shaft 4L mounted adjacent theintake end of the tube 1 and is provided at one end with the crank 5connected by pitman 6 with the crank 7 on shaft 8. This shaft is mountedeccentrically in the cylindrical bushing 9, and is adapted to be turnedSpecification of Letters Patent.

Patented Dec. 21, 1920.

Serial No. 271,648.

or partly rotated therein, and the bushing 9 s mounted to turn in thebearing 10 formed 111 or attached to the cap 11, the latter beingsecured to the outer end of the cylinder 12. The bushing or barrel 9 isprovided at its outer end, outside of cap 11, with the crank 13 which isconnected by rod 14 with mechanism on the dash or within reach of thedriver whereby the said barrel or bushing 9 may beturned or adjustedwhile the engine is running.

Secured to the inner end of shaft 8 within the cap 11, is the arm 15carrying a roller 16 which rests within a slot in the head 17 of thepiston 18. The slot in which the roller 16 rests extends crosswise thehead and is of a size sutficient to receive the roller 16 without anylost motion between the parts. The upper end of the head is in the formof a cylindrical rod 19 which is supported for vertical movement in thebearing 20 at the upper end of cap 11. The piston 18 is integral with orsecured to the head 17 and has a close fit in cylinder 12 which ispreferably cast integral with the suction tube 1 of the carbureter.

Piston 18 is also located in the cylinder 12 below piston 18 and isrigidly secured to the upper end of the needle valve 21, which isprovided with a shoulder 22 for cutting ofl' the supply of gasolene, andwith a tapering end 23 for regulating the supply, the said tapering endbeing constructed to feed the proper proportion of gasolene to make theproper mixture with the air admitted around the throttle valve. When thethrottle valve is closed, the needle valve should be seated on itsshoulder 22, and as the throttle is opened the needle valve will belifted as explained below to permit of the passage of gasolene, inamounts varying with the extent of the opening around the throttle.

Pistons 18 and 18 are located in the cylinder l2, and a port 24:connects the suction tube 1 of the carburetor with cylinder 12 betweenthe two pistons so that when the engine is working the suction from thelatter tends to pull the pistons 18 and 18 toward each other, but aspiston 18 is held against such movement by the crank arm 15 to which itis connected, piston 18 will move upwardly toward piston 18 and carrywith it the needle valve 21, thus permitting the gasolene to flow fromthe spray 255 coupled up to a gasolene supply vtank, the

extent of said upward movement of the piston 18 and the needle valvebeing governed by the position of the pin 26 carried by the upper piston18.

lylinder 12 is provided with a port 12 opening into the outer air from apoint below the needle carrying piston so as to provide "for the freeentrance and escape of air from the underside of the latter.

Mounted in the hub of the upper piston 18 is the stop pin 26 having ahead which is in line with the hub of piston 18 or with the end of theneedle valve in said hub. This pin has a vertical movement in the piston18 and terminates at its upper end in a slot 27 formed in the head 17 ofpiston 18, and is sustained in such position by the pin holding device28 passing through the upper end of the stop pin and normally resting onthe floor of said slot 27. The slot 27 is of a length sufficient topermit of longitudinal movement of the stop pin 26, so that normally thesaid pin is free to give and move upwardly with the lower piston 18until stopped by its head engaging the hub of the upper piston and isonly held down and in contact with the lower piston when the needlevalve is closed and there is no suction through the carbureter as willbe explained later on.

This stop pin acts as a stop for the lower piston and its positionrelative to the latter is regulated and controlled by the upper piston.

lVith the throttle valve 3 and upper piston 18 connected as previouslyexplained, it follows that when the throttle valve is operated to admitair, the upper piston will be elevated, the extent of upward movement ofthe latter being controlled by the extent of opening movement of thethrottle. It now the engine be cranked or otherwise started, the suctionthrough the suction tube 1 ot the carburetor creates a suction in port24- and the cylinder 12, which is in communication with said port andproduces a vacuum in the cylinder which tends to pull the pistons towardeach other. As the upper piston is connected with the. lever and crankmechanism previously explained, and hence is only movable when saidparts are actuated for opening or closing the throttle valve, it followsthat when tl e vacuum is created in the cylinder, the upper pistonrei'nains stationary and the lower one moves up carrying with it theneedle valve 21, the extent of upward or opening movement of said needlevalve being dependent on the extent of the opening around the throttlevalve. As the lower piston moves up it engages the head of the stop pin26 and elevates the latter until the head of the pin contacts with theend of the hub of the upper piston where it remains immovable as long asthe suction is continued through the suction tube 1. vlVhen the throttlevalve 3 is closed, or suction discontinued through the suction tube 1,the vacuum in the cylinder 12 is destroyed thus permitting the lowerpiston 18 to drop to its lowermost position, and seat the closingshoulder 22 oi the needle valve onto its seat on the spray nozzle.

The means for holding the needle valve down onto its seat when thethrottle valve is closed, comprises the lever 29 mounted on a bracket 30fixed to or integral with the head 17 of the piston 18. One end of thelever rests within slot 27 in the head 17, immediately over the upperend of stop pin 26, while the opposite end of said lever rests in theplane of the upper end 01 the upwardly pressed spring plunger 31. As thethrottle valve is turned to its closed position, the upper piston 18 andits head 17, are through the parts 56T and 8, moved downwardly to theirlowermost positions, and this downward movement of the head 1'? carriesone end of lever 29 into contact with the upper end of plunger 81. Thiscontact first causes lever 29 to turn on its fulcrum until it bears onthe upper end of stop pin, and the continued downward movement of thelever compresses the spring under the plunger and which operates to holdthe stop pin with a yielding pressure against the lower piston 18 andthe needle valve carried by the latter and absolutely prevents anyaccidental movement or displacement of the needle and consequentflooding of the suction tube 1 of the carbureter. When the throttlevalve is closed the needle valve is also closed and is so held by thestop pin until the throttle valve is again opened.

As previously explained the shaft 8 which is a part of the connectionbetween the throttle valve and the upper piston, is mountedeccentricaliy in the bushing 9 which is connected by crank 13 and rod 1&to operating mechanism located within reach of the operator, so that thebushing may be turned for adjusting or changing the position of theshaft 8 with relation to the upper piston, hence after the parts havebeen set it should be found necessary to increase or decrease the amountof fuel to the air admitted around the throttle, this can beaccomplished by turning the bushing 9 to elevate the shaft 8 in theevent more fuel is needed, or turning the bushing in a direction tolower the shaft and thus decrease the lift of the needle valve in theevent less fuel. is needed.

lVith this improvement the action of the needle valve is automaticallycontrolled by the movements of the throttle valve, when the engine isrunning, but when the engine is not running, and consequently no suctionin tube 1, the needle valve will be seated and remain seated until theengine is started.

It is evident that many slight changes might be resorted to in therelative arrangement of parts shown and described without departing fromthe spirit and scope of my invent-ion. Hence I would have it understoodthat I do not wish to confine myself to the exact construction andarrangement of parts shown and described but,

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is

1. In a carbureter, the combination of a suction tube having a spraynozzle therein, a cylinder, two pistons in the latter one be ing freeand the other manually adjustable whereby the extent of movement of thefree piston carrying the valve is regulated, the suction tube havingcommunication with the cylinder intermediate the two pistons, and aneedle valve carried by the free piston and cooperating with the spraynozzle in the suction pipe.

2. in a carbureter, the combination of a suction tube having a spraynozzle and a throttle valve therein, a cylinder, two pistons in thelatter one of said pistons having connection with the throttle valve soas to move therewith and'the other being free whereby the extent ofmovement of the free piston is controlled by the extent of movement ofthe other piston, the suction tube having communication with thecylinder intermediate the two pistons whereby the free piston is liftedby the suction in the suction tule. and a needle valve carried by thefree piston and cooperating with the spray nozzle in the suction tube.

3. in a carbureter, the combination of a suction tube having a spraynozzle and a throttle valve therein, a cylinder in communication withsaid suction tube, a piston in said cylinder and adapted to be moved bythe vacuum created in the cylinder, a needle valve carried by saidpiston and cooperating with the spray nozzle in the suction tube, a stopwithin the cylinder, means connecting the stop and throttle valvewhereby when the throttle valve is opened for the passage of air thestop will be raised to permit the piston carrying the needle valve torise, and other means for adjusting the stop independently of thethrottle valve.

4. In a carbureter the combination of a suction tube having a spraynozzle and a throttle valve therein, a cylinder having communicationwith said suction tube, a piston in said cylinder and operated by thesuction therein, a needle valve carried by said piston and coiiperatingwith the spray nozzle, a stop within the cylinder for limiting themovement of the piston, means connecting said stop and the throttlevalve whereby they will be simultaneously adjustedfand means foryieldingly holding said valve on its seat when the throttle valve isclosed.

5. In a carbureter, the combination of a suction tube having a spraynozzle and a throttle valve therein, a cylinder having a portcommunicating with said suction tube, a piston in said cylinder, aneedle valve carried by said piston, a stop in the cylinder for limitingthe movement of the piston, a cylindrical bushing, a shaft eccentricallymounted in said bushing, means connecting said shaft with the stop,means connecting it with the throttle valve whereby it will have aturning movement simultaneously with that of the throttle valve andmeans for turning the bushing whereby the relative adjustment of theshaft and throttle valve will be changed.

6. In a carbureter, the combination of a suction tube having a spraynozzle and throttle valve therein, a cylinder having a portcommunicating with said suction tube, two pistons in said cylinder andat opposite sides of the port, the lower piston being free and adaptedto be moved upwardly by suction, a needle valve carried by the freepiston, a rotary shaft having a crank connection with the other piston,and connection between said shaft and throttle valve whereby they areactuated in unison for regulating the extent of upward movement of thefree piston.

7. In a carbureter, the combination of a suction tube having a spraynozzle and a throttle valve therein, a cylinder having a portcommunicating with said suction tube, two pistons in said cylinder, oneof said pistons being free, a needle valve carried by the free piston, arotary shaft having crank connection with the other piston, a bushing inwhich said shaft is eccentrically mounted, means for turning the bushingand means connecting the shaft and throttle valve whereby when thethrottle valve is actuated the shaft and the piston connected with saidshaft will be actuated to move the said piston away from or toward thefree piston.

8. In a carbureter, the combination of a suction tube having a spraynozzle and the throttle valve therein, a cylinder having a portconnection with the suction tube, a piston in said cylinder and adaptedto be moved upwardly by suction in the cylinder, a needle valve carriedby said piston, a movable stop for limiting the opening move ment of theneedle valve, means connecting said stop and the throttle valve wherebythe step will be moved away from the needle valve when the throttlevalve is opened and moved toward the said needle valve when the throttlevalve is opened and spring actuated means for holding said stop down onthe piston when the suction is discontinned whereby the needle valvewill be held down on the spray nozzle and close the latter.

9. In a earbureter, the combination of a suction tube having a spraynozzle therein, a cylinder having a port connection with said tube, twopistons in said cylinder, manually operated means for moving one piston,a needle valve carried by the other piston, a stop carried by themanually operated piston and movable thereby and also having movementindependent thereof, a spring actuated plunger, and a lever connectedWith said manually operated piston and adapted to engage the springplunger when the manually operated piston is depressed and be forced bythe latter into contact with the adjacent end of the stop, foryieldingly holding the latter down into a position to prevent anyapcidental opening movement of the needle valve While the manuallyoperated piston is maintained in its depressed position.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

CHARLES H. ANDERSON. lVitnesses:

A. W. BR GH D. M. PAoKr.

